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Accurate Damping Estimation by Automated OMA Procedures

机译：通过自动oma程序准确阻尼估算

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摘要

Systems and techniques for fast damage detection based on vibration analysis are becoming very attractive in different engineering fields. Modal-based damage detection algorithms are well-known techniques for structural health assessment. However, the lack of automated modal identification and tracking procedures has been for long a relevant limit to their extensive use. The development of several automated output-only modal identification procedures in the last few years has led to a renewed interest in modal-based damage detection. However, robustness of automated modal identification algorithms, computational efforts and reliability of modal parameter estimates (in particular, damping) still represent open issues. In this paper, a novel algorithm for automated output-only modal parameter estimation is adopted to obtain reliable and very accurate modal parameter estimates. An extensive validation of the algorithm for continuous monitoring application is carried out based on simulated data. The obtained results point out that the algorithm provides fairly robust, accurate and precise estimates of the modal parameters, including damping ratios. This may potentially lead to a standardized, extensive characterization of modal damping ratios in structures, which is useful to gain knowledge about damping mechanisms in structures and to develop predictive models.
机译：基于振动分析的快速损伤检测的系统和技术在不同的工程领域变得非常有吸引力。基于模态的损伤检测算法是结构健康评估的众所周知的技术。但是，缺乏自动模态识别和跟踪程序一直是他们广泛使用的相关限制。在过去几年中开发了几个自动输出的模态识别程序导致了对基于模态损伤检测的重新兴趣。然而，自动模态识别算法的稳健性，模态参数估计的计算工作和可靠性（特别是阻尼）仍然代表公开问题。本文采用一种用于自动输出模态参数估计的新颖算法来获得可靠且非常精确的模态参数估计。基于模拟数据执行对连续监测应用算法的广泛验证。所获得的结果指出，该算法提供了模态参数的相当稳健，准确，精确的估计，包括阻尼比率。这可能导致结构中的模态阻尼比的标准化，广泛表征，这对于获得结构中的阻尼机制和开发预测模型是有用的。

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